A powerful field of cars rewarded a huge crowd Saturday night at the Hamilton County Speedway with a great night of racing in all classes as the Iron Man Challenge made its maiden voyage to the half-mile clay oval.

The Iron Man Challenge returns to action on Saturday, Aug. 20, at the Hamilton County Speedway in Webster City, Iowa, followed by a date at the Nobles County Speedway in Worthington, Minn., on Sunday.

Six events are in the books for the Iron Man Challenge featuring USRA Karl Chevrolet Stock Cars and USRA Karl Performance Parts B-Mods, with 10 different winners emerging from 11 feature races so far.

Seventeen dates at eleven dirt ovals comprise the 2011 schedule for the second season of the Iron Man Challenge for USRA Karl Chevrolet Stock Cars and USRA Karl Performance Parts B-Mods.

Jake Masters of Graettinger rolled to his third victory in his last five starts Wednesday night as the Dart Iron Man Challenge invaded the Hamilton County Speedway for Round 10 of the tough-as-nails series for USRA Karl Chevrolet Stock Cars.

This Wednesday, August 18, the newly-formed hard-as-nails series for the full-fendered USRA Karl Chevrolet Stock Cars ventures to the Hamilton County Speedway in Webster City and then make their debut on Thursday night at the Hancock County Speedway in Britt.